1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . S T A C K _ C H E C K I N G . O P E R A T I O N S --
-- --
-- B o d y --
-- --
-- Copyright (C) 1999-2018, Free Software Foundation, Inc. --
-- --
-- GNARL is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNARL was developed by the GNARL team at Florida State University. --
-- Extensive contributions were provided by Ada Core Technologies, Inc. --
-- --
------------------------------------------------------------------------------
-- This is the verson for VxWorks 5, VxWorks 6 Cert and VxWorks MILS
-- This file should be kept synchronized with the general implementation
-- provided by s-stchop.adb.
pragma Restrictions (No_Elaboration_Code);
-- We want to guarantee the absence of elaboration code because the
-- binder does not handle references to this package.
with System.Storage_Elements; use System.Storage_Elements;
with System.Parameters; use System.Parameters;
with Interfaces.C;
package body System.Stack_Checking.Operations is
-- In order to have stack checking working appropriately on VxWorks we need
-- to extract the stack size information from the VxWorks kernel itself.
-- For VxWorks 5 & 6 the library for showing task-related information
-- needs to be linked into the VxWorks system, when using stack checking.
-- The taskShow library can be linked into the VxWorks system by either:
-- * defining INCLUDE_SHOW_ROUTINES in config.h when using
-- configuration header files, or
-- * selecting INCLUDE_TASK_SHOW when using the Tornado project
-- facility.
-- VxWorks MILS includes the necessary routine in taskLib, so nothing
-- special needs to be done there.
Stack_Limit : Address;
pragma Import (C, Stack_Limit, "__gnat_stack_limit");
-- Stack_Limit contains the limit of the stack. This variable is later made
-- a task variable (by calling taskVarAdd) and then correctly set to the
-- stack limit of the task. Before being so initialized its value must be
-- valid so that any subprogram with stack checking enabled will run. We
-- use extreme values according to the direction of the stack.
type Set_Stack_Limit_Proc_Acc is access procedure;
pragma Convention (C, Set_Stack_Limit_Proc_Acc);
Set_Stack_Limit_Hook : Set_Stack_Limit_Proc_Acc;
pragma Import (C, Set_Stack_Limit_Hook, "__gnat_set_stack_limit_hook");
-- Procedure to be called when a task is created to set stack
-- limit.
procedure Set_Stack_Limit_For_Current_Task;
pragma Convention (C, Set_Stack_Limit_For_Current_Task);
-- Register Initial_SP as the initial stack pointer value for the current
-- task when it starts and Size as the associated stack area size. This
-- should be called once, after the soft-links have been initialized?
-----------------------------
-- Initialize_Stack_Limit --
-----------------------------
procedure Initialize_Stack_Limit is
begin
Set_Stack_Limit_For_Current_Task;
-- Will be called by every created task
Set_Stack_Limit_Hook := Set_Stack_Limit_For_Current_Task'Access;
end Initialize_Stack_Limit;
--------------------------------------
-- Set_Stack_Limit_For_Current_Task --
--------------------------------------
procedure Set_Stack_Limit_For_Current_Task is
type OS_Stack_Info is record
Size : Interfaces.C.int;
Base : System.Address;
Limit : System.Address;
end record;
pragma Convention (C, OS_Stack_Info);
-- Type representing the information that we want to extract from the
-- underlying kernel.
procedure Get_Stack_Info (Stack : not null access OS_Stack_Info);
pragma Import (C, Get_Stack_Info, "__gnat_get_stack_info");
-- Procedure that fills the stack information associated to the
-- currently executing task.
Stack_Info : aliased OS_Stack_Info;
Limit : System.Address;
begin
-- Get stack bounds from VxWorks
Get_Stack_Info (Stack_Info'Access);
if Stack_Grows_Down then
Limit :=
Stack_Info.Base - Storage_Offset (Stack_Info.Size) +
Storage_Offset'(12_000);
else
Limit :=
Stack_Info.Base + Storage_Offset (Stack_Info.Size) -
Storage_Offset'(12_000);
end if;
Stack_Limit := Limit;
end Set_Stack_Limit_For_Current_Task;
end System.Stack_Checking.Operations;
|
